 *{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/*主体*/
nav{
    z-index: 1;
}
.navbar-light .navbar-brand{
    color: #ffffff!important;
    font-weight:bold;
    font-size: 25px;
}
.nav-link{
    color: #ffffff!important;
}
.a2{
    border-top: 2px solid #ffffff;
    border-left: 2px solid #ffffff;
    width: 15px;
    height: 15px;
    display: block;
    position: absolute;
    top:7px;
    margin-left:4px;
}
 .a3{
     border-right: 2px solid #ffffff;
     border-bottom: 2px solid #ffffff;
     width: 15px;
     height: 15px;
     display: block;
     position: absolute;
     top: 23px;
     margin-left:32px;
 }

header{
    background-image: url(img/header-bg-1.jpg);
    background-position: center;
    background-size: cover;
    height:100vh;
    margin-top: -65px;
}
header:after {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height:100vh;
    background-color: rgba(0, 0, 0, 0.5);
    content: '';
}
.content{
    text-align: center;
    color: #ffffff;
    position: relative;
    top: 300px;
    z-index: 1;
}
.content h1{
    font-size: 3.5rem;
    font-weight: bold;
}

.right{
    width:50%;
    float: right;
}
section h3{
    font-weight:bold;
    font-size: 35px;
    margin-top: 20px;
}
.he_nav {
    margin-top: 20px;
}
.he_nav p{
    height:3px;
    background: #000000;
    width: 200px;
}
.he_nav span{
    border: 2px solid #D3D3D3;
    background:#000000;
    transform: rotate(135deg);
    display: inline-block;
    width: 15px;
    height: 15px;
    position:relative;
    top: -28px;
    left: 90px;
}
.about ul{
    display: flex;
    flex-wrap: wrap;
}
.about ul li{
    list-style: none;
    width: 275px;
    margin-bottom:20px;
}

.nav1{
    background:#000000!important;
    margin-bottom: 50px;
}
.about button{
    border: 2px solid #000000;
    width: 95px;
    padding-top:5px;
    padding-bottom:5px;
    background: #ffffff;
    margin-top:10px;
}
 .about button:hover{
     background:#000000;
     background-color: rgba(0, 0, 0, 0.8);
     color: #ffffff;
     transition-duration:1s;
 }
.top1 {
     text-align: center;
    margin-bottom: 40px;
}
.top1 .he_nav p{
    margin: 0 auto;
}
.top1 .he_nav span{
    top: -12px;
    left: 0px;
}
.ul1{
display: flex;
flex-wrap: wrap;
margin-bottom:0px !important;
}
.ul1 li{
    width:31%;
    height:242px;
    background-color:#ffffff;
    list-style: none;
    margin-right: 30px;
    margin-bottom: 30px;
    padding:10px;
    text-align: center;
}
 .ul1 li img{
     margin-top: 20px;
 }
 .ul1 li p{
     font-size: 13px;
     margin-top:-5px;
 }
.ul1 li:hover{
    box-shadow: 0px 0px 16px 2px #000;
    transition-duration:1s;
}
.ul1 li:nth-child(3){
margin-right: 0px;
}
.ul1 li:last-child{
    margin-right: 0px;
    }
.ul1 li a{
        text-align: center;
        text-decoration: none;
    color:#000000;
    }
 .ul1 li h3{
     margin-bottom: 16px;
 }
.nav2{
    background-color: #eee;
    padding-top:80px;
    padding-bottom:40px;
}

.ul2{
    display: flex;
    flex-wrap: wrap;
    }
.ul2 li{
        width:32%;
        height:236px;
        background-color:#ffffff;
        list-style: none;
        margin-right: 10px;
        margin-bottom: 10px;
        overflow: hidden;
    }
.ul2 li:nth-child(3){
    margin-right: 0px;
    }
.ul2 li:last-child{
        margin-right: 0px;
        }
.ul2 li a img{
    width: 100%;
}
.nav-item{
    margin-left:5px;
}
.nav-link{
    padding: 10px!important;
}
section::after{
display: table;
contain: "";
clear: both;
}
section{
    padding-top:50px;
    padding-bottom: 50px;
}
.zhuan .container{
    display: table;
    content: "";
    clear: both;
    margin-bottom: 50px;
}
.zhuan_right{
    width: 49%;
    float: left;
    margin-right: 9px;
}
.zhuan_right img{
    float: left;
}
.zhuan_right ul li{
    padding: 20px;
    width: 85%;
    height: 153px;
    border: 1px solid #eee;
    float:right;
    margin-top: 30px;
    list-style: none;
    box-shadow: 0px 0px 4px 2px #EEEEEE;
}
.zhuan_left img{
    float: left;
}
.zhuan_left ul li{
    padding: 20px;
    width: 85%;
    height: 153px;
    border: 1px solid #eee;
    float:right;
    margin-top: 30px;
    list-style: none;
    box-shadow: 0px 0px 4px 2px #EEEEEE;
}
.zhuan_left{
    width: 50%;
    float: left;
}
.ul2 li a{
    position: relative;
}
 .ul2 li a:hover .zhe{
     margin-top: 0px;
     transition-duration:1s;
 }
.zhe{
    background: #000;
    width: 100%;
    height:237px;
    position: absolute;
    background-color: rgba(0, 0, 0, 0.7);
    margin-top:236px;
    text-align: center;
}
 .zhe h1{
     line-height: 220px;
     color: #ffffff;
 }
#nav2{
    display: none;
    padding-bottom:0px !important;
    padding-top:0px !important;
    background: #000000;
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.7);
}
.nav3{
    padding-top: 50px !important;
}
.contact{
    background: #eee;
    padding-bottom: 1px;
    padding-top:50px;
}
 .contact_left{
     width: 30%;
     float: left;
 }
.contact_left ul li{
    width: 100%;
    height: 170px;
    background: #ffffff;
    text-align: center;
    padding-top:15px;
    list-style: none;
    margin-bottom: 30px;
}
 .contact_left ul li h3{
     font-weight:bold;
 }
 .contact_left ul li img{
     width: 75px;
 }
 .contact_right{
     width: 67%;
     float: right;
 }
 .input1{
     width: 360px;
     border-radius:5px ;
     border:1px solid #eee;
     padding: 19px;
 }
 .input1:first-child{
     margin-right:19px;
 }
 .input2{
     width: 100%;
     padding: 19px;
     border-radius:5px ;
     border:1px solid #eee;
     margin-top: 30px;
 }
 .input3{
     width: 100%;
     height: 290px;
     padding: 19px;
     border-radius:5px ;
     border:1px solid #eee;
     margin-top: 30px;
 }
 .button1{
     border: 2px solid #000000;
     background:#ffffff;
     padding: 10px;
     width: 130px;
     font-weight: bold;
     margin-top: 38px;
 }
 .contact .container{
     display: table;
     content: "";
     clear: both;
 }
 footer::after{
     display: table;
     content: "";
     clear: both;
 }
 footer{
     background: #ffffff;
     height: 140px;
 }
 footer ul{
     display: flex;
     justify-content:center;
     margin-top: 20px;
     margin-bottom: 20px;
 }
 footer ul li{
     list-style: none;
     width: 40px;
     height:40px;
     background: #000;
     margin-left:17px;
     transform: rotate(-45deg);
     border: 2px solid #CACACA;
 }
 footer ul li:hover{
     transform: rotate(0deg);
     transition-duration:1s;
 }
 footer ul li img{
     padding-top:7px;
     padding-left:4px;
     display: block;
     margin: 0 auto;
     transform: rotate(46deg);
 }
 footer ul li:hover img{
     transform: rotate(0deg);
 }
 footer p{
     text-align: center;
     font-size: 18px;
 }
 footer .container{
     margin-bottom: 10px !important;
 }

 @media (max-width:600px){
.nav2{
    content: "";
    clear: both;
    display: table;
}
.container{
    width: 100%;
}
}